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Status Submitted
Workspace Db2 Utilities Suite for z/OS
Created by Guest
Created on Dec 30, 2025

RELATED IDEAS

Add new behavior to REORG TEMPLATE STACK to take advantage of parallel processing for PBR/PBG at partition level while using ICLIMIT_TAPE

LISTDEF REO11002
INCLUDE TABLESPACE DRATEEM1.SEMHNSA PARTLEVEL(549:551) PBR NPSI
ICLIMIT_TAPE 2
PARALLEL (30)


STACK NO behavior
There will be no UNLOAD/RELOAD parallelism due to STACK YES being on the TEMPLATE for the Image Copy even though ICLIMIT_TAPE 2 is present. For large partition or more partitions being reorged this can increase the elapsed time.


STACK YES behavior
In the example above, this would provide UNLOAD/RELOAD parallelism across 2 drives. This is what a DBA wants, 2 tape drives, 2 tape volumes minimal.

Using the following LISTDEF illustrates a major issue when using TAPE when this is in the same step. SEMHST1 will use 2 tape drive and 2 volumes minimal. The REO12002 LISTDEF will use 2 tape drives but a different tape volume for each PBG. This will only use 1 tape drive, but will use 6 Tape volumes. This can bring a system to it's knees.

LISTDEF REO11002
INCLUDE TABLESPACE DREGREM1.SEMHST1 PARTLEVEL(551:552)

LISTDEF REO12002
INCLUDE TABLESPACE DREGRLP1.SLPLZ1E
INCLUDE TABLESPACE DREGRPEP.SPEPACH
INCLUDE TABLESPACE DREGRPEP.SPEPCSC
INCLUDE TABLESPACE DREGRPEP.SPEPNAP
INCLUDE TABLESPACE DREGRPEP.SPEPTDF
INCLUDE TABLESPACE DREGRPT1.SPTCCGC

Enhanced Stack

Using the LISTDEFs above the PBR would use 2 tape drives and 2 volumes at a minimum. The PBG would use 1 tape drive and 1 tape volume at a minimum. Using this enhanced method should also work on the following.

LISTDEF REO11002
INCLUDE TABLESPACE DREGREM1.SEMHST1 PARTLEVEL(551:552)
INCLUDE TABLESPACE DREGRLP1.SLPLZ1E
INCLUDE TABLESPACE DREGRPEP.SPEPACH
INCLUDE TABLESPACE DREGRPEP.SPEPCSC
INCLUDE TABLESPACE DREGRPEP.SPEPNAP
INCLUDE TABLESPACE DREGRPEP.SPEPTDF
INCLUDE TABLESPACE DREGRPT1.SPTCCGC
INCLUDE TABLESPACE DREGREM1.SEMHST2 PARTLEVEL(5,6,9)

This would allow the DBA to use unload/load parallelism without worrying about using excessive tape volumes. We use DB2 Automation Tool to generate the REORG jobs weekly



Needed By Yesterday (Let's go already!)

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